Decadal variability of heat content in the South China Sea inferred from observation data and an ocean data assimilation product

Wei, Song; Lan, Jing; Liu, Qinyan; Sui, Dandan; Zeng, Lili

doi:10.5194/os-10-135-2014

Cited by 18 publications

(7 citation statements)

References 21 publications

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“…The decreasing trend is also closely related to the Pacific Decadal Oscillation index. Song et al (2014) found that the upper layer heat content possesses an increasing trend during our study period. That may indicate that the increasing surface temperature will increase the temperature differences between the atmosphere and ocean, and ultimately increase the release of turbulent heat flux and decrease the Q net .…”

Section: Resultssupporting

confidence: 55%

Estimation of the surface heat budget over the South China Sea

Feng

Liu

Lin

et al. 2016

Atmospheric and Oceanic Science Letters

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In situ data are employed to evaluate five gridded surface heat flux datasets over the South China Sea. The surface heat budgets for these gridded datasets are computed. The authors find that the gridded datasets tend to underestimate both the solar radiation and sensible heat flux in general, while the latent heat fluxes are close to the observations, except for that of NOC unadjusted version 2 (NOC2), which overestimates both the latent and sensible heat flux. The underestimation of solar radiation also indicates that the gridded datasets might underestimate the surface heat budget. The net surface heat flux of the five gridded datasets is always positive. However, the net surface heat flux of COADS, NOC1, NOC2, and OAFlux, in the range 48-56 W m , which is significantly larger (around 10%-20%) than previous estimations. 摘要

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Section: Resultssupporting

confidence: 55%

Estimation of the surface heat budget over the South China Sea

Feng

Liu

Lin

et al. 2016

Atmospheric and Oceanic Science Letters

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“…Smaller marginal seas have also experienced the OHC variations, and pure heaving effect would also be important in the marginal seas if ocean circulation controls isotherm changes over the region [e.g., Song et al ., ]. The linear warming trend of nonseasonal OHC in the East/Japan Sea (EJS) was shown to be about two times higher than those in the global and Pacific Oceans according to Na et al .…”

Section: Introductionmentioning

confidence: 99%

An east‐west contrast of upper ocean heat content variation south of the subpolar front in the East/Japan Sea

Yoon

Chang

et al. 2016

JGR Oceans

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Long‐term variability of nonseasonal ocean heat content (OHC) in the upper 500 m in the East/Japan Sea (EJS) exhibits a distinct east‐west contrast during the recent 30 years. The contrasting OHC variations are revisited and investigated more in detail by analyzing two observational data sets, the gridded data from 1976 to 2007 and in situ data from 1976 to 2011 in the southwestern EJS that covers the zone of western boundary current. The OHC variability shows in‐phase and predominant decadal variation in both east and west regions before 1995, but uncorrelated and predominant interannual variations after 1995. Heaving effects due to major branches of warm currents in the EJS, the East Korea Warm Current (EKWC) in the western part and other two branches in the eastern part, mainly contribute to the OHC variations. The heaving effect in the western EJS is shown to be associated with changes in winter wind‐stress curl field in the northern EJS. Weakening of the subpolar gyre due to weakening of positive wind‐stress curl in the Japan Basin related with wintertime Western Pacific teleconnection pattern and Siberian High appears to enhance the northward penetration of the EKWC resulting in an increase of OHC in the western EJS. The heaving effect in the eastern EJS is significantly correlated with the Siberian High, but the causative mechanism is inconclusive. This study also demonstrates the importance of using highly resolved data sets for areas affected by strong and narrow boundary currents in computing and understanding the OHC variability.

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“…The SODA reanalysis was originally made to produce a comprehensive dataset for the oceans using existing local observations and numerical model simulations (Carton and Giese, ). The SODA data are used in the estimation of OHC over other oceans with good accuracy (Song et al ., ). The new version of SODA was used in this analysis as it was forced by the MERRA dataset.…”

Section: Methodsmentioning

confidence: 99%

Analyses of the oceanic heat content during 1980–2014 and satellite‐era cyclones over Bay of Bengal

Anandh

Das

Kumar

et al. 2018

Intl Journal of Climatology

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Bay of Bengal (BoB) is one of the most cyclone prone regions in the world. Cyclones receive energy from warm ocean surface waters and the change in cyclone activity generally depends on the change in heat energy available in the upper ocean. Here, we use satellite‐based Modern Era Retrospective‐analysis for Research and Applications dataset, and reanalysis of Simple Ocean Data Assimilation (SODA) and European Centre for Medium‐range Weather Forecasts–Ocean ReAnalysis System 4 (ECMWF–ORAS4) to analyse the oceanic heat content (OHC) and heat flux to identify sources of the additional heat input in the region during the period 1980–2014. It has been observed that during 1999–2014, heat energy is mainly stored in the southern and northwestern parts of the bay and it shows an increasing trend in both regions. In the analysis of OHC, the European Centre for Medium‐range Weather Forecasts (ECMWF) data show a trend of −0.87 × 1018 J/month during 1980–1998 and 7.58 × 1018 J/month during 1999–2014 whereas, the SODA data show a trend of 0.94 × 1018 J/month during 1980–1998 and 5.25 × 1018 J/month during 1999–2014. It is found that many cyclones are seeded in the southeastern bay and intensified over the northwestern bay, consistent with the increase in cyclone heat potential and the upper ocean heat content (UOHC) in those regions. The heat flux in the bay is primarily governed by the heat entering the eastern side and leaving through the western side. In 1999–2014, the incoming heat flux along the eastern boundary has increased significantly (from 0.18 × 1012 to 0.57 × 1012 W/month), indicating that more heat enters the region. Furthermore, a significant reduction in the outgoing heat flux along the western boundary has also been found from the analysis. These processes trap the heat and thereby contributing to the increase in OHC in the bay. The heat flux through the bay is mainly linked with conditions prevailing over Pacific Ocean, such as, the heat influx of BoB decreases during El‐Nino and increases during La‐Nina years.

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Decadal variability of heat content in the South China Sea inferred from observation data and an ocean data assimilation product

Cited by 18 publications

References 21 publications

Estimation of the surface heat budget over the South China Sea

Estimation of the surface heat budget over the South China Sea

An east‐west contrast of upper ocean heat content variation south of the subpolar front in the East/Japan Sea

Analyses of the oceanic heat content during 1980–2014 and satellite‐era cyclones over Bay of Bengal

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